Sash-lock.



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UNITED STATES PATENT OFFICE.

DANIEL IIOYT, OF SOUTH NORWALK, CONNECTICUT.

SASH-LOCK.

SPECIFICATION forming part of Letters Patent N o. 651,570, dated J une12, 1900.

Application filed August Z1, 1899. Serial No. 727,902. (No model.)

-To all whom t may concern: l

Be it known that I, DANIEL HOYT, a citizen of the United States, and aresident of South Norwalk, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inSash-Locks,

of which the following is a specification.

The object of my invention is to produce a simple sasl1-lock by whichthe sash may be 1o made to stay and be locked in any position zo thesides of which arepivoted levers b, the

levers being of such shape and pivoted in such a manner that as theirends are moved from each other the bearing-surfaces will be caused toengage more firmly with the window-sash. The shape is generally that ofa cam of increasing radius. The ends of the levers are normally keptapart by a leaf-spring c. On the end of one of the levers is a link d,adapted to engage with the notch ein the other lever, whereby the endsof the two levers may be kept together, thus keeping the fastener out ofthe locking position. The faces of these cams are corrugated,as clearlyshown. Secured to the window-frame in any suitable manner is a strip ofmetal f, the surface of which is corrugated, as shown, to correspond tothe corrugations on the locking-pieces. These corrugations are made ofany desired shape or size. In small Windows the corrugations arepreferably close together. It will be obvious that as the ends of thelevers are brought close to each other the sash can be fastener whichwill keep the sash in any pov sition, but also one which will lock thesash in such manner that it cannot be forced open without breaking thefastener, and I also avoid injury to the wood of the window-frame. Inthat style ot' lock where the cam bears directly on the wood of theframe it will of course take but a comparatively-short time to wear thewood, so that thel sash can be moved up and down, notwithstanding thelocking devices, with but comparatively little effort.

What I claim, and desire to secure by Letters Patent, is-

Inla sash-fastener the combination of a casing adapted to be secured tothe sash, levers pivoted in said casing, said levers having corrugatedcam-surfaces, a strip of metal on the window-frame having a surfacecorrugated to correspond with the corrugations of the cams, whereby saidsash may be locked in anyposition, and means for keeping the operatingends of the levers normally apart, a link carried by one arm and a notchon the other for engaging said link, substantially as described. Y

Signed at the city of New York,in the county of New York and State ofNew York, this 16th day of August, A. D. 1899.

DANIEL I-IoYfr. i

Witnesses:

FRANCIS B. KAIN, JOHN A. PEW.

